Introduce a new ioctl to control whether remote flushing via Hyper-V hyper-calls should be allowed on a vCPU. When the tlb_flush_inhibit bit is set, vCPUs attempting to flush the TLB of the inhibitied vCPU will be suspended until the bit is clearded.
Signed-off-by: Nikolas Wipper <[email protected]> --- include/uapi/linux/kvm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 637efc055145..3bc43fdcab88 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -933,6 +933,7 @@ struct kvm_enable_cap { #define KVM_CAP_PRE_FAULT_MEMORY 236 #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237 #define KVM_CAP_X86_GUEST_MODE 238 +#define KVM_CAP_HYPERV_TLB_FLUSH_INHIBIT 239 struct kvm_irq_routing_irqchip { __u32 irqchip; @@ -1573,4 +1574,18 @@ struct kvm_pre_fault_memory { __u64 padding[5]; }; +/* Available with KVM_CAP_HYPERV_TLBFLUSH */ +#define KVM_HYPERV_SET_TLB_FLUSH_INHIBIT \ + _IOW(KVMIO, 0xd6, struct kvm_hyperv_tlb_flush_inhibit) + +/* for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT */ +struct kvm_hyperv_tlb_flush_inhibit { + /* in */ + __u16 flags; +#define KVM_HYPERV_UNINHIBIT_TLB_FLUSH 0 +#define KVM_HYPERV_INHIBIT_TLB_FLUSH 1 + __u8 inhibit; + __u8 reserved[5]; +}; + #endif /* __LINUX_KVM_H */ -- 2.40.1 Amazon Web Services Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597
